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If you were in the 10 r/hr area for 72 hr out of doors, you'd absorb around 30 r. If you were inside a house, it'd be more like 10 r. Fission products have a pretty steep decay curve. After 72 hr, what started with 10 r/hr of fission products becomes 0.06 r/hr.
Another way to look at it: 5 R is max annual exposure allowed for US radiation workers. It is a very conservative dose. You start to see cancer effects on a population (small ones, but measurable ones) at about 10 R. This chart helpful for comparisons: https://xkcd.com/radiation/
(In case it isn't obvious — I have a little Excel spreadsheet that does these calculations. Will eventually make a little web app for it; hoping to integrate it into NUKEMAP.)
Noticed in your profile you created NUKEMAP, which I have played with before. Thanks for that! And thanks for the informative response!
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